Holder for incandescent lamps



Feb. 20, 1934. Q CQNRADTY 1,948,166

HOLDER FOR INCANDESCENT LAMPS Filed Nov. 3, 1927 Patented Feb. 20, 1934 UNITED STATES PATENT OFFICE Application November 3, 1927, Serial No. 230,757, and in Germany June 24, 1927 9 Claims.

My invention relates to improvements in holders for incandescent lamps, and the object of the improvements is to provide a holder which is resistant to corrosion and destruction by acid vapors and atmospheric conditions, and with this object in View my invention consists in constructing all the parts of the holder from materials which are not affected by chemical vapors and the like. For example, the current conducting parts, that is, the contact members which carry current to the contacts of the incandescent lamp of the holder may be made from stainless steel or other non-corrosive metal such as silicon steel. In many cases such materials will be sufi'icient. But in other cases I have found it necessary to manufacture the said parts from materials which are even more resistant to chemical influences, and I have found that certain carbon materials such as coal or graphite are suitable for being used as current conducting parts. The said conducting parts made from stainless steel or carbon are disposed within a casing or socket which is likewise made from a material resisting the action of acids and other vapors, such as glass,

5 porcelain, baked argile, artificial resin, or other natural or artificial insulating material.

For the purpose of explaining the invention an example embodying the same has been illustrated in the accompanying drawing, wherein Fig. 1 is a sectional view of a socket in accordance with the present invention having an incandescent lamp bulb screwed therein and Fig. 2 is a perspective view showing the manner in which the component socket members are assembled.

In the example shown in the drawing the holder comprises a cap-shaped casing or socket a, made from glass, porcelain or the like. In the bottom of the casing 11, a contact block b is located, and also within the casing a second contact block c of annular form is embedded, both contact blocks being made from a suitable noncorrosive metal or carbon material such as coal or carbon adapted to conduct electric current. For simplicity only representations of carbon conducting blocks are shown since the construction and arrangement of the blocks is substantially the same whether they be composed of carbon or non-corrosive metal. The blocks are separated from each other by a disk-shaped body 11 of insulating material such as porcelain, the said body being formed with a hole permitting the end of the base 9 of the incandescent lamp h to pass through the same. The block 0 is formed with internal screw threads corresponding to the screw threads of the base g. The outer portion of the socket or casing a is formed with internal screw threads, and it has a ring e screwing therein, the said ring holding the blocks b, c and the body at together. It appears therefore that all the parts are held together merely by means of the ring e, and that the method of assembling the-parts is exceedingly simple.

The leading-in wires 1 are passed through holes 7' made in the wall of the casing a, and they are fixed therein by pressing a suitable plastic insulating medium into the holes 7. In a modification the ends of the leading-in wires are screwed into similar bores. Preferably, the leading-in wires consist of stainless steel, and they are connected to the socket terminals by means of sleeves or by soldering.

For protecting the metallic base 9 from injury by acid vapors, I prefer to screw a packing ring f into the outer portion of the screw-threaded part of the casing a, the said packing ring being made from caoutchouc, asbestos or the like. Preferably, the said ring is made tight by a suitable acidproof lacquer.

I have found that an incandescent lamp and its holder constructed as described above is perfectly tight without needing difficult packing, and that it is safe and durable under most exacting conditions.

I claim:

1. A holder for incandescent lamps comprising a socket composed of acid-proof material and adapted to have an incandescent lamp fixed therein, contact members for carrying electric current to the contacts of the lamp, said current conducting members being composed of acidproof material arranged within said socket, and an acid-proof ring detachably fastened in said socket and adapted to contact a conducting member and hold it in position.

2. A holder for incandescent lamps comprising a socket composed of acid-proof material and adapted to have an incandescent lamp fixed therein, contact members adapted to carry current to the contacts of the lamp arranged within said socket and being composed of carbon, and an acid-proof ring detachably fastened in said socket and adapted to contact a current-conducting contact member and to hold it in position.

3. A holder for incandescent lamps comprising a socket composed of acid-proof material and adapted to have an incandescent lamp fixed therein, contact members for carrying current to the contacts of said lamp within said socket, said current-conducting members being composed of acid-proof material, and insulating material sepathe separate holder members to allow disassembly' by removing the ring only.

5. A holder for incandescent lamps comprising a hollow shell-like socket composed of acid-proof material and adapted to have an incandescent lamp fixed therein, current conducting blocks arranged within said socket and composed of acid-proof material, insulating material separating said blocks, said blocks being shaped to contact with the contacts of the lamp and convey electric current thereto, and an acid-proof ring screw-fastened in said socket and adapted to contact a conducting member and to hold it in position.

6. A holder for incandescent lamps comprising a hollow shell-like socket having block-like contact members therein composed of carbon for conveying current to the contacts of the lamp and an acid-proof ring screw-fastened in the socket so as to hold together the separate holder members to allow disassembly by removing the ring only.

7. A holder for incandescent lamps comprising a hollow shell-like socket composed of acid-proof material and adapted to have an incandescent lamp fixed therein, and current-conducting blocklike contact members composed of carbon and. adapted to convey current to the contact members of the incandescent lamp Within the socket and an acid-proof ring screw-fastened in the socket so as to hold together the separate holder members to allow disassembly by removing the ring only.

8. A holder for incandescent lamps comprising a hollow, shell-like socket composed of acid-proof material and adapted to have an incandescent lamp fixed therein, current-conducting blocks arranged Within said socket and composed of carbon, insulating material separating said blocks, said blocks being shaped to contact with the contacts of the lamp and convey current thereto, and an acid-proof ring detachably fastened in said socket and adapted to contact a conducting member and hold it fixed in position.

O'I'TMAR CONRADTY. 

